Here are links to recent reviews and video demos of the new RSPduo:
SWLing.com review: https://swling.com/blog/2018/05/a-review-of-the-sdrplay-rspduo-14-bit-dual-tuner-sdr/
Sevenfortyone video: https://youtu.be/8WNxtanfWIk
Tech Minds video 1: https://youtu.be/wxu0ZJUvATE
Tech Minds video 2 showing ATC and ADSB together: https://youtu.be/_842u1k8tQY
OG! Review: https://youtu.be/T-eXoNskDmA